In general, if you are comfortable using the FreeBSD ports system you
should be able to easily use the NetBSD's pkgsrc system. The basic
commands are the same:

make

make install

make clean

One exception is FreeBSD's make config command. NetBSD's pkgsrc uses
the command make show-options. Like FreeBSD's ports system, not all
the ports have config options. Also, there is no config option dialog.
For any entry in pkgsrc that you think might have options, you will
have to manually run make show-options. This will show you the available
options and the options that enabled. To disable an options you prefix
the option with a minus(-) sign. Here:
http://wiki.netbsd.org/pkgsrc/how_to_use_pkg_options_with_pkgsrc/is an example from the NetBSD Wiki.
roddie rod
2013-03-18